diff --git a/tests/main.test.ts b/tests/main.test.ts
index 2560089..6e525c1 100644
--- a/tests/main.test.ts
+++ b/tests/main.test.ts
@@ -1314,6 +1314,30 @@ it(`should download latest pnpm from custom registry`, async () => {
   });
 });
 
+it(`should download from npm registry url by default`, async () => {
+  await xfs.mktempPromise(async cwd => {
+    process.env.npm_config_registry = `https://registry.npmmirror.com`;
+    process.env.COREPACK_ENABLE_DOWNLOAD_PROMPT = `1`;
+
+    await xfs.writeJsonPromise(ppath.join(cwd, `package.json` as Filename), {
+      packageManager: `pnpm@10.1.0`,
+    });
+
+    await expect(runCli(cwd, [`pnpm`, `--version`])).resolves.toMatchObject({
+      exitCode: 0,
+      stdout: `10.1.0\n`,
+      stderr: `! Corepack is about to download https://registry.npmmirror.com/pnpm/-/pnpm-10.1.0.tgz\n`,
+    });
+
+    // Should keep working with cache
+    await expect(runCli(cwd, [`pnpm`, `--version`])).resolves.toMatchObject({
+      exitCode: 0,
+      stdout: `10.1.0\n`,
+      stderr: ``,
+    });
+  });
+});
+
 describe(`should pick up COREPACK_INTEGRITY_KEYS from env`, () => {
   beforeEach(() => {
     process.env.AUTH_TYPE = `COREPACK_NPM_TOKEN`; // See `_registryServer.mjs`
diff --git a/tests/npmRegistryUtils.test.ts b/tests/npmRegistryUtils.test.ts
index b90d54f..752505f 100644
--- a/tests/npmRegistryUtils.test.ts
+++ b/tests/npmRegistryUtils.test.ts
@@ -36,6 +36,15 @@ describe(`npm registry utils fetchAsJson`, () => {
     expect(httpFetchAsJson).lastCalledWith(`${process.env.COREPACK_NPM_REGISTRY}/package-name`, {headers: DEFAULT_HEADERS});
   });
 
+  it(`loads from npm registry url`, async () => {
+    // `process.env` is reset after each tests in setupTests.js.
+    process.env.npm_config_registry = `https://registry.example.org`;
+    await fetchAsJson(`package-name`);
+
+    expect(httpFetchAsJson).toBeCalled();
+    expect(httpFetchAsJson).lastCalledWith(`${process.env.npm_config_registry}/package-name`, {headers: DEFAULT_HEADERS});
+  });
+
   it(`adds authorization header with bearer token if COREPACK_NPM_TOKEN is set`, async () => {
     // `process.env` is reset after each tests in setupTests.js.
     process.env.COREPACK_NPM_TOKEN = `foo`;
@@ -50,6 +59,20 @@ describe(`npm registry utils fetchAsJson`, () => {
     }});
   });
 
+  it(`uses npm registry url if COREPACK_NPM_TOKEN is set`, async () => {
+    // `process.env` is reset after each tests in setupTests.js.
+    process.env.COREPACK_NPM_TOKEN = `foo`;
+    process.env.npm_config_registry = `https://registry.example.org`;
+
+    await fetchAsJson(`package-name`);
+
+    expect(httpFetchAsJson).toBeCalled();
+    expect(httpFetchAsJson).lastCalledWith(`${process.env.npm_config_registry}/package-name`, {headers: {
+      ...DEFAULT_HEADERS,
+      authorization: `Bearer ${process.env.COREPACK_NPM_TOKEN}`,
+    }});
+  });
+
   it(`only adds authorization header with bearer token if COREPACK_NPM_TOKEN and COREPACK_NPM_USERNAME are set`, async () => {
     // `process.env` is reset after each tests in setupTests.js.
     process.env.COREPACK_NPM_TOKEN = `foo`;